When I reached the chapter introducing the subjunctive, the vocabulary lists several conjunctions with the same meaning--hina, hopos, ophra. My question is, as you may have guessed, is if these words are interchangeable, or if have different shades of meaning. I mean, I fully expect them to not be interchangeable, and what I am really asking is whether anyone knows how these words are different from each other. The textbook, as far as I've looked ahead, does not enlighten me on the matter.